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<title>class REXML::Formatters::Pretty - rexml: Ruby Standard Library Documentation</title>


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  <h3>Parent</h3>

  <p class="link"><a href="Default.html">REXML::Formatters::Default</a>
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  <h3>Methods</h3>

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    <li ><a href="#method-i-indent_text">#indent_text</a>
    <li ><a href="#method-i-wrap">#wrap</a>
    <li class="calls-super" ><a href="#method-i-write_cdata">#write_cdata</a>
    <li class="calls-super" ><a href="#method-i-write_comment">#write_comment</a>
    <li ><a href="#method-i-write_document">#write_document</a>
    <li ><a href="#method-i-write_element">#write_element</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-REXML::Formatters::Pretty">
    <h1 id="class-REXML::Formatters::Pretty" class="class">
      class REXML::Formatters::Pretty
    </h1>

    <section class="description">
    
<p>Pretty-prints an XML document.  This destroys whitespace in text nodes and will insert carriage returns and indentations.</p>

<p>TODO: Add an option to print attributes on new lines</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">



        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-compact" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">compact</span><span
                class="attribute-access-type">[RW]</span>
            </div>

            <div class="method-description">
              <p>If compact is set to true, then the formatter will attempt to use as little space as possible</p>
              </div>
            </div>
          <div id="attribute-i-width" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">width</span><span
                class="attribute-access-type">[RW]</span>
            </div>

            <div class="method-description">
              <p>The width of a page.  Used for formatting text</p>
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">( indentation=2, ie_hack=false )</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Create a new pretty printer.</p>
<dl class="rdoc-list note-list"><dt>output
<dd>
<p>An object implementing ‘&lt;&lt;(String)’, to which the output will be written.</p>
</dd><dt>indentation
<dd>
<p>An integer greater than 0.  The indentation of each level will be this number of spaces.  If this is &lt; 1, the behavior of this object is undefined.  Defaults to 2.</p>
</dd><dt>ie_hack
<dd>
<p>If true, the printer will insert whitespace before closing empty tags, thereby allowing Internet Explorer’s XML parser to function. Defaults to false.</p>
</dd></dl>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 30</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>( <span class="ruby-identifier">indentation</span>=<span class="ruby-value">2</span>, <span class="ruby-identifier">ie_hack</span>=<span class="ruby-keyword">false</span> )
  <span class="ruby-ivar">@indentation</span> = <span class="ruby-identifier">indentation</span>
  <span class="ruby-ivar">@level</span> = <span class="ruby-value">0</span>
  <span class="ruby-ivar">@ie_hack</span> = <span class="ruby-identifier">ie_hack</span>
  <span class="ruby-ivar">@width</span> = <span class="ruby-value">80</span>
  <span class="ruby-ivar">@compact</span> = <span class="ruby-keyword">false</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="protected-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Protected Instance Methods</h3>
                </header>

                  <div id="method-i-write_cdata" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_cdata</span><span
                                class="method-args">( node, output)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Default.html#method-i-write_cdata"><code>REXML::Formatters::Default#write_cdata</code></a>
                              </div>

                              <div class="method-source-code" id="write_cdata-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 102</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_cdata</span>( <span class="ruby-identifier">node</span>, <span class="ruby-identifier">output</span>)
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&#39; &#39;</span> <span class="ruby-operator">*</span> <span class="ruby-ivar">@level</span>
  <span class="ruby-keyword">super</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write_comment" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_comment</span><span
                                class="method-args">( node, output)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              
                                <div class="method-calls-super">
                                  Calls superclass method
                                  <a href="Default.html#method-i-write_comment"><code>REXML::Formatters::Default#write_comment</code></a>
                              </div>

                              <div class="method-source-code" id="write_comment-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 97</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_comment</span>( <span class="ruby-identifier">node</span>, <span class="ruby-identifier">output</span>)
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&#39; &#39;</span> <span class="ruby-operator">*</span> <span class="ruby-ivar">@level</span>
  <span class="ruby-keyword">super</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write_document" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_document</span><span
                                class="method-args">( node, output )</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="write_document-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 107</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_document</span>( <span class="ruby-identifier">node</span>, <span class="ruby-identifier">output</span> )
  <span class="ruby-comment"># Ok, this is a bit odd.  All XML documents have an XML declaration,</span>
  <span class="ruby-comment"># but it may not write itself if the user didn&#39;t specifically add it,</span>
  <span class="ruby-comment"># either through the API or in the input document.  If it doesn&#39;t write</span>
  <span class="ruby-comment"># itself, then we don&#39;t need a carriage return... which makes this</span>
  <span class="ruby-comment"># logic more complex.</span>
  <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">child</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">child</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>[<span class="ruby-value">-1</span>] <span class="ruby-keyword">and</span> <span class="ruby-identifier">child</span>.<span class="ruby-identifier">instance_of?</span>(<span class="ruby-constant">Text</span>)
    <span class="ruby-keyword">unless</span> <span class="ruby-identifier">child</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>[<span class="ruby-value">0</span>] <span class="ruby-keyword">or</span> <span class="ruby-identifier">child</span>.<span class="ruby-identifier">instance_of?</span>(<span class="ruby-constant">Text</span>) <span class="ruby-keyword">or</span>
      (<span class="ruby-identifier">child</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>[<span class="ruby-value">1</span>] <span class="ruby-keyword">and</span> <span class="ruby-operator">!</span><span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">writethis</span>)
      <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;\n&quot;</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">write</span>( <span class="ruby-identifier">child</span>, <span class="ruby-identifier">output</span> )
  }
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write_element" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_element</span><span
                                class="method-args">(node, output)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="write_element-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 39</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_element</span>(<span class="ruby-identifier">node</span>, <span class="ruby-identifier">output</span>)
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&#39; &#39;</span><span class="ruby-operator">*</span><span class="ruby-ivar">@level</span>
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-node">&quot;&lt;#{node.expanded_name}&quot;</span>

  <span class="ruby-identifier">node</span>.<span class="ruby-identifier">attributes</span>.<span class="ruby-identifier">each_attribute</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">attr</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot; &quot;</span>
    <span class="ruby-identifier">attr</span>.<span class="ruby-identifier">write</span>( <span class="ruby-identifier">output</span> )
  <span class="ruby-keyword">end</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">attributes</span>.<span class="ruby-identifier">empty?</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">empty?</span>
    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@ie_hack</span>
      <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot; &quot;</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;/&quot;</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;&gt;&quot;</span>
    <span class="ruby-comment"># If compact and all children are text, and if the formatted output</span>
    <span class="ruby-comment"># is less than the specified width, then try to print everything on</span>
    <span class="ruby-comment"># one line</span>
    <span class="ruby-identifier">skip</span> = <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">compact</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">inject</span>(<span class="ruby-keyword">true</span>) {<span class="ruby-operator">|</span><span class="ruby-identifier">s</span>,<span class="ruby-identifier">c</span><span class="ruby-operator">|</span> <span class="ruby-identifier">s</span> <span class="ruby-operator">&amp;</span> <span class="ruby-identifier">c</span>.<span class="ruby-identifier">kind_of?</span>(<span class="ruby-constant">Text</span>)}
        <span class="ruby-identifier">string</span> = <span class="ruby-string">+&quot;&quot;</span>
        <span class="ruby-identifier">old_level</span> = <span class="ruby-ivar">@level</span>
        <span class="ruby-ivar">@level</span> = <span class="ruby-value">0</span>
        <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">child</span><span class="ruby-operator">|</span> <span class="ruby-identifier">write</span>( <span class="ruby-identifier">child</span>, <span class="ruby-identifier">string</span> ) }
        <span class="ruby-ivar">@level</span> = <span class="ruby-identifier">old_level</span>
        <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&lt;</span> <span class="ruby-ivar">@width</span>
          <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">string</span>
          <span class="ruby-identifier">skip</span> = <span class="ruby-keyword">true</span>
        <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">unless</span> <span class="ruby-identifier">skip</span>
      <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;\n&quot;</span>
      <span class="ruby-ivar">@level</span> <span class="ruby-operator">+=</span> <span class="ruby-ivar">@indentation</span>
      <span class="ruby-identifier">node</span>.<span class="ruby-identifier">children</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">child</span><span class="ruby-operator">|</span>
        <span class="ruby-keyword">next</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">child</span>.<span class="ruby-identifier">kind_of?</span>(<span class="ruby-constant">Text</span>) <span class="ruby-keyword">and</span> <span class="ruby-identifier">child</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
        <span class="ruby-identifier">write</span>( <span class="ruby-identifier">child</span>, <span class="ruby-identifier">output</span> )
        <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;\n&quot;</span>
      }
      <span class="ruby-ivar">@level</span> <span class="ruby-operator">-=</span> <span class="ruby-ivar">@indentation</span>
      <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&#39; &#39;</span><span class="ruby-operator">*</span><span class="ruby-ivar">@level</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-node">&quot;&lt;/#{node.expanded_name}&quot;</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">&quot;&gt;&quot;</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write_text" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write_text</span><span
                                class="method-args">( node, output )</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="write_text-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 88</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write_text</span>( <span class="ruby-identifier">node</span>, <span class="ruby-identifier">output</span> )
  <span class="ruby-identifier">s</span> = <span class="ruby-identifier">node</span>.<span class="ruby-identifier">to_s</span>()
  <span class="ruby-identifier">s</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp">/\s/</span>,<span class="ruby-string">&#39; &#39;</span>)
  <span class="ruby-identifier">s</span>.<span class="ruby-identifier">squeeze!</span>(<span class="ruby-string">&quot; &quot;</span>)
  <span class="ruby-identifier">s</span> = <span class="ruby-identifier">wrap</span>(<span class="ruby-identifier">s</span>, <span class="ruby-ivar">@width</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@level</span>)
  <span class="ruby-identifier">s</span> = <span class="ruby-identifier">indent_text</span>(<span class="ruby-identifier">s</span>, <span class="ruby-ivar">@level</span>, <span class="ruby-string">&quot; &quot;</span>, <span class="ruby-keyword">true</span>)
  <span class="ruby-identifier">output</span> <span class="ruby-operator">&lt;&lt;</span> (<span class="ruby-string">&#39; &#39;</span><span class="ruby-operator">*</span><span class="ruby-ivar">@level</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">s</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-indent_text" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">indent_text</span><span
                                class="method-args">(string, level=1, style=&quot;\t&quot;, indentfirstline=true)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="indent_text-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 124</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">indent_text</span>(<span class="ruby-identifier">string</span>, <span class="ruby-identifier">level</span>=<span class="ruby-value">1</span>, <span class="ruby-identifier">style</span>=<span class="ruby-string">&quot;\t&quot;</span>, <span class="ruby-identifier">indentfirstline</span>=<span class="ruby-keyword">true</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">string</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">level</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">string</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/\n/</span>, <span class="ruby-node">&quot;\n#{style*level}&quot;</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-wrap" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">wrap</span><span
                                class="method-args">(string, width)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="wrap-source">
            <pre><span class="ruby-comment"># File rexml-3.2.6/lib/rexml/formatters/pretty.rb, line 129</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">wrap</span>(<span class="ruby-identifier">string</span>, <span class="ruby-identifier">width</span>)
  <span class="ruby-identifier">parts</span> = []
  <span class="ruby-keyword">while</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">width</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">place</span> = <span class="ruby-identifier">string</span>.<span class="ruby-identifier">rindex</span>(<span class="ruby-string">&#39; &#39;</span>, <span class="ruby-identifier">width</span>)
    <span class="ruby-identifier">parts</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">string</span>[<span class="ruby-value">0</span><span class="ruby-operator">...</span><span class="ruby-identifier">place</span>]
    <span class="ruby-identifier">string</span> = <span class="ruby-identifier">string</span>[<span class="ruby-identifier">place</span><span class="ruby-value">+1</span><span class="ruby-operator">..</span><span class="ruby-value">-1</span>]
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">parts</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">string</span>
  <span class="ruby-identifier">parts</span>.<span class="ruby-identifier">join</span>(<span class="ruby-string">&quot;\n&quot;</span>)
<span class="ruby-keyword">end</span></pre>
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